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[llvm.noalias] add llvm.noalias to pointer use visitor.
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Authored by amehsan on Aug 16 2017, 2:00 PM.

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hfinkel
Summary

This lets SROA (and pontentially other users of PtrUseVisitor) see through llvm.noalias intrinsic. Without this, SROA does misses some optimization opportunities because the pointers escapes through the intrinsic

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amehsan created this revision.Aug 16 2017, 2:00 PM